Jsp Corporation

Masato Naito

Naochika Kogure

Daisuke Imanari

Takashi Kitahama

Masayasu Okuda

Hidehiro Sasaki

Tomoo Tokiwa

Hideki Kuwabara

Kenichi Takase

Noritoshi Nishiyama

Shohei Tsuchida

Kazuo Tsurugai

Hiroyuki Gokuraku

Seiji Takahashi

Teruyuki Akiyama

Ryo Kikusawa

Diasuke Imanari

Kazuo Turugai

Ryou Kikusawa

Keigo Narita

A method for producing a hollow foam molding having a thin and uniform wall thickness, including extruding a foamable melt containing a polypropylene resin having an equilibrium compliance Jof 0.5&#xd7;10to 1.8&#xd7;10Paand a swell ratio Sof 2.5 or less and a physical blowing agent through a die to obtain a parison having a softened polypropylene resin foam layer, placing the parison in a mold, and blowing a gas into the parison to obtain a hollow foam molding having a hardened polypropylene resin foam layer with an apparent density of 0.35 to 0.65 g/cm.

Method of forming hollow foam moldings

A hollow foamed blow-molded article has a polypropylene-based resin foam layer, wherein the polypropylene-based resin foam layer has an equilibrium compliance Jeof 2.0&#xd7;10Paor more and a swell S of 2.5 or less, wherein the foam layer has an apparent density 'd' of 0.20 to 0.65 g/cmand a ratio a/c of an average cell diameter 'a' in the thickness direction of the molded article to an average cell diameter &#x201c;c&#x201d; in the longitudinal direction of the molded article of 0.1 to 0.5. The hollow foamed blow-molded article has an average molded article thickness T of 1 to 5 mm and a variation coefficient Cv of the molded article thickness of 50% or less.

Hollow foamed blow-molded article

The present invention pertains to a skin-covered foamed molded article of expanded propylene resin beads having excellent lightness in weight, mechanical properties and appearance. The present invention provides a skin-covered foamed molded article of propylene resin expanded beads, with the skin covering substantially the entire surface of the molded article of the expanded beads. The skin, within which the molded article of expanded propylene resin beads is placed, is a propylene resin hollow molded body obtained by blow molding. A base resin of which the skin is formed comprises a propylene resin having a partial heat of fusion in a temperature range between 80 and 140&#xb0; C. of at least 15 J/g and a ratio of the partial heat of fusion to a total heat of fusion (partial heat of fusion/total heat of fusion) of at least 0.2 as measured by heat flux differential scanning calorimetry. The skin has a thickness in the range of 0.3 to 3.5 mm, and the molded article of expanded propylene resin beads has an apparent density in the range of 0.015 to 0.15 g/cm. The skin is fuse-bonded to the molded article of expanded beads, and the expanded beads from which the molded article is formed are fuse-bonded to each other.

Skin-covered propylene resin foamed molded article

A polylactic acid resin foamed molding obtained by placing in a mold a cylindrical body having a foamed layer, which is formed by extruding a foamable molten resin composition prepared by kneading together a polylactic acid resin and a physical blowing agent from a die into a low-pressure zone, and molding it, wherein

Polylactic acid resin foamed molding and process for manufacturing the same

Provided is a method for manufacturing a foam-molded article by molding between molds a parison with a foam layer formed by extruding an expandable molten resin composition, obtained by melt-kneading a polyethylene resin and a physical foaming agent, to an area of low pressure from a die, wherein the polyethylene resin is selected from those having a melt flow rate of 0.1 to 25 g/10 minutes and a melt tension of not less than 1.5 cN, and wherein the apparent density of the foam layer in the foam-molded article is about 0.04 to 0.3 g/cm.

Foam-molded article and manufacturing method thereof

Description is made of an open cell polystyrene resin foam having a content of organic volatile matters of less than 100 ppm. The open cell foam is suitable as a core material for a sound insulating material or a vacuum heat insulating material. The open cell foam can be produced by melt-kneading a polystyrene resin having a content of organic volatile matters of 100 ppm or higher together with water in an extruder, sucking out the organic volatile matters as an azeotrope with water through a vent, injecting a blowing agent and kneading the injected mixture, and extruding the mixture into a lower pressure area to cause the resin to foam.

Core material for vacuum heat insulation material, and vacuum heat insulation material

The present invention relates to a hollow molded foam article in which a plurality of polypropylene resins are used as the base resin, and to a process for the production of this hollow molded foam article. More particularly, the present invention relates to a polypropylene resin hollow molded foam article having a foam layer, in which the base resin comprises (a) a polypropylene resin with a melt tension of at least 98 mN and a melt flow rate of 0.5 to 15 g/10 minutes, (b) a polypropylene resin with a melt tension of less than 30 mN (excluding O) and a melt flow rate of 2 to 30 g/10 minutes, and (c) a polypropylene resin with a melt tension of at least 30 mN and less than 98 mN and a melt flow rate of 2 to 15 g/10 minutes, formed by positioning in a mold a softened cylindrical foam having a foam layer obtained by extruding from the die of an extruder a foamable molten resin composition containing a foaming agent, wherein the melt tension at 230&#xb0; C. of the polypropylene resin that forms the foam layer is at least 10 mN and less than 49 mN, and the apparent density of the foam layer is no more than 0.3 g/cm.

Polypropylene resin hollow molded foam article and a process for the production thereof

A method for production of an extruded, polystyrene-based foam plate wherein a polystyrene-based resin is heated and kneaded together with a blowing agent, a flame retardant and a nucleating agent in an extruder to obtain a foamable molten composition, and the foamable molten composition is extruded through a die attached to an end of the extruder into a lower pressure zone. The blowing agent comprises not smaller than 25% by weight but not greater than 65% by weight, based on the total weight of the blowing agent, of an isobutane-containing saturated hydrocarbon; not smaller than 5% by weight but not greater than 70% by weight, based on the total weight of the blowing agent, of a dimethyl ether-containing ether; not smaller than 5% by weight but not greater than 55% by weight, based on the total weight of the blowing agent, of carbon dioxide; and 0&#x2013;25% by weight, based on the total weight of the blowing agent, of other blowing agent components.

Method for production of extruded, polystyrene-based resin foam plate and extruded foam plate obtained thereby

Extruded polyolefin resin foam

The invention relates to an apparatus for manufacturing expansion-molded articles continuously by conveying foamed beads into a heating region sandwiched between upper and lower belts. The apparatus has a belt that continuously travels along the upper inside face of a passageway, defined by structural members, whose cross-section constitutes an approximately rectangular shape and a belt that continuously travels along the lower inside face thereof. At least one of the upper and lower structural members that form the passageway is capable of movement in the vertical direction between the side-face structural members such that the thickness of the expansion-molded article can easily be varied. And at least one of the side-face structural members is capable of movement in the lateral direction between the upper and lower structural members such that the width of the expansion-molded article can easily be varied.

Apparatus for producing expansion-molded article

Disclosed herein is a method for continuously producing an expansion-molded article, comprising feeding foamed particles between a belt continuously traveling along the upper surface within a passageway defined by structural members and having a rectangular form in section and a belt continuously traveling along the lower surface within the passageway, and then causing the foamed particles to successively pass through a super heated steam-feeding region and a cooling region within the passageway. The foamed particles used are foamed particles of a polyolefin resin, in which a recovery factor from compression defined by the equation (1):

Process for producing an expansion-molded article

Prefoamed synthetic resin particles are produced by dispersing foamable resin particles in a dispersing medium within a closed vessel, said foamable resin particles containing a water-soluble inorganic substance and a blowing agent therein, and then releasing the foamable resin particles and the medium into an atmosphere of a pressure lower than that inside the vessel, whereby the thus-released foamable resin particles are allowed to undergo foaming.

Production method of prefoamed synthetic resin particles

A process for the production of expanded resin particles is disclosed, wherein an aqueous dispersion containing expandable particles of a polyolefin resin is discharged at a temperature higher than the softening point of the resin from a high pressure condition to a low pressure condition to expand the expandable particles and wherein the expandable particles contain fine particles of an inorganic material coated with an agent selected from isopropyltriisostearic titanate, tetraoctadecyl titanate, acetoalkoxyaluminum diisopropylates, stearic acid, methyltrimethoxysilane, methyltriethoxysilane, ethyltriethoxysilane, phenyltriethoxysilane and vinyltriethoxysilane.

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Kanuma, Japan

Masato Naito